Here are my thoughts based on the discussion so far, and topics raised ...
i don't get the fascination with portables -- mobile, yeah, i want to take it from this room to that room, but i never go out (unless provoked), so vaping at my desk, tv chair, or bed is all i'm looking for. i think more and more people will spend more time at home - particularly as we (the boomers) age.
cooling? meh. bong water gets yucky too quickly, the bong is a pita to clean, and i don't want a bong leaking onto my keyboard. i find with a glass expansion chamber -- from 12mm x 35mm vial into 16mm x 150mm draw tube -- the vapor cools enough. i plan to get some 18mm or 25mm tubes soon to see where the sweet spot is.
re: concentrates. i have lived by the rule of "know your chemist, personally". so i eschew big pharm (i don't believe in allopathic medicine, any medicine for that matter). i will not be interested in what the big guys do in this market either in devices or concentrates.
re: batteries. research on batteries has only just begun. i'm looking forward to the energy storage and current flow of two 26650 LiFePO4s in a 2"x2"x1/4" thick square. But working with what's available, i am quite satisfied with a two cell power pack. i'm getting 12 sessions (90 minutes) from a charge which satisfies me for 2 to 3 days.
re: independent vaporizer inventor. i have limited expectations. i don't want to (at this point) be a major company. i'm focusing on techno-art projects. so i don't see Ploom or VXH or 7th Floor being any competition. This will be a seller's market for quite some time. so i agree with lwien's take on the craftsman market.
@lwien -- your bong water heater would be very easy to do. my heater does ambient to 500°F (auto upper limit cutoff) -- should be pretty efficient at that lower temp, too.
Also, legalization of cannabis does nothing to rescind the drug paraphernalia law that prohibits manufacture and sale of same. it might be useful for the big guys to spend some lobby money to get that fixed.
But otherwise, i don't see the big companies doing anything of interest. but, then again, i paint all the biggies as just another color of Monsanto. Yuck!
I just want perfection. Is that too much?
Ah! that's the Bud Toaster. So, no that's not too much.